doesn’t qu-ax make a similar vehicle?
i believe it’s called the double uni
It`s called QU-AX Balance Trainer
https://qu-ax.de/catalog/QU-AX-Balance-Trainer-blau
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So if I buy one of these, replace the saddle with handlebars and ride it backwards, do I have a half-bike? 
You don`t have to replace the saddle, just turn it by 90° degrees. 
Or buy a halfbike and sit on the handlebar, ride it backwards and you have a balance trainer.
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And not only is it ridiculous, have a look at the price…
Isn`t it a modern version of the “dandy horse” invented by Karl Drais in 1817?
Arguably so is a kick scooter / footbike
Or better yet a kids balance bike, is pretty much exactly a “dandy horse” with modern componentry.
P.S. Strider even has a balance model for adults.
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Hmm, I wonder whether it’s possible to start over if you loose your balance in the middle of the lake…
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Maybe that’s the parallel to unicycling.
You have to learn to freemount.
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Remove the cranks and the chain and any bike becomes a balance bike. They’re excellent for teaching kids how to ride, but there’s no reason to buy a purpose built one.
I think for very small kids learning there is (2yr olds for example). They make them very small and they are still lighter than a bike with parts removed.
P.S. If anyone is looking for a nice and light one, Yedoo (who also make footbikes, like mine pictured above) make some high quality ones for kids.
P.P.S. Strider’s adult model is primarily marketed at people with balance or mobility issues or also those who are developmentally challenged, i.e. markets where the rider might never “progress” to a bike. In this case I think a dedicated balance bike probably is better.
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mhm didn’t know we have this thread. I can see this one is missing from the collection :
Mhm the Lopifit is unfortunately electric, but I don’t see why they couldn’t create a non-electric one. Then again I thought the orbit wheels were also electric. The videos of those make it seem impossible to learn.
The bicymple looks like a Hoppley bike, just with bigger wheels. At some point I will get me a hoppley bike, possibly in some far future where I will be less frowned upon by my wife 
Also would love to try those Hydrofoil bikes, but I think they are quite expensive and never will be any cheaper.
Yes, as long as your battery is good it can be started in open water. It would likely be very hard to start just like it would be very hard to ride at hydrofoil speed for very long without a battery.
Oh, they’re electric. Now I’m disappointed. 
I’ll agree when it comes to the disabled, but I found my own kids only took about a week to figure out how to ride on a balance bike and then they were off and pedalling a couple days later. I didn’t teach them to ride until about age 4 though
Have a read of Motor vs. Manual – Manta5 EU
It says
If you’re a cycling purist, the XE-1 may not be for you.
guess that’s me. Ok, TBH, I also ride motor bikes, but the ones without any pedals. I’m a purist on this end of the scale, too. 
I still can’t quite get over the fact they actually made this into a bike.